Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.2: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Growth and properties of epitaxial Sr2CrReO6 thin films — •F. Czeschka, S. Geprägs, S.T.B. Goennenwein, M. Opel, and R. Gross — Walther-Meißner-Institut, Bayerische Akademie derWissenschaften, Walther-Meißner-Str. 8, 85748 Garching
In the last couple of years a tremendous interest in new materials with high spin polarisation for spintronic devices has been
emerged. One group of these materials are the ferromagnetic double perovskites Sr2BB′O6 (with B a magnetic transition
metal ion, and B′ a non-magnetic ion). Among them, Sr2CrReO6 has the highest transition temperature (TC = 635 K) observed so far and band structure calculations predict a high spin polarisation of P≈86%. We have prepared Sr2CrReO6 thin films by laser molecular beam epitaxy on (001) SrTiO3 substrates. The films were grown in different atmospheres (Ar, O2), at various pressures (6× 10−4mbar ≤ pO2≤ 5× 10−2mbar) and in a wide range of substrate temperatures (450∘C ≤ TS ≤ 900∘C). The films are c-axis oriented and coherently strained. We found, that thin films grown at TS=700∘C in an oxygen atmosphere with pO2= 6.6× 10−4mbar show optimal magnetic and crystallographic properties, as evident from the full width at half maximum of the rocking curves. Moreover, our films show a high degree of B site order. The hysteresis loops at 25K reveal a high saturation magnetization of 0.8µB per formula unit and a high coercive field of 1.2T. We discuss these observations and compare them to results from magnetotransport measurements.
This work is supported by the DFG via SPP1157.